Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cf07ef3839c63f…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 04:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f17d3a9982d973fad1f82096d36bae7a SHA-1: b232714f45c811a853e8251da45ac980de73cb38 SHA-256: 81cf07ef3839c63fb79c4ff7a48d9d4a9746ab86e499600da3a45a3919a1eba5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/123?utm_term=harbinger+weight+lifting+belt+size+guide PDF link annotation
    • http://getepitisux.mywebcommunity.org/filirumemiwujedaparufasu.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/gjbibtD/fake_call_app_iphone_free.pdfIn PDF document text
    • http://balewezekowesab.iblogger.org/ielts_writing_vocabulary_task_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/jaHgcjd/zilefixuwojutabivutajet.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ys2hbhj/drunkard_s_path_template_set.pdfIn PDF document text
    • http://reduslim-sito.site/what_is_a_waking_dream6qptr.pdfIn PDF document text
    • http://storeyou.store/diablo_3_necromancer_corpse_lance_build_season_21fy4fq.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/how_to_take_the_front_cover_off_a_whirlpool_duet_washer.pdfIn PDF document text
    • http://fabunek.iblogger.org/adaptability_test_questions.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/diferencias_entre_caput_succedaneum_y_cefalohematoma.pdfIn PDF document text
    • http://cmbclientes.com/kaxajuzuvubokb2wel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_084b0efcf519429f942cb77c362c4a34.pdf?index=trueIn PDF document text
    • http://fabonek.rf.gd/xujaxakumibusujawepojur.pdfIn PDF document text
    • http://forimewobelik.rf.gd/47660573212.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/54764888625.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_8cd9a1ce93fb4e619213c5b56df1e005.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bad4e4-1d68-4119-b34f-feb788162830/sennheiser_ew_100_g4_e945.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/76944437854.pdfIn PDF document text
    • http://xelepidozagetof.epizy.com/brahmastra_advanced_maths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e300d4-5f06-4880-9eaa-5d328c8584ec/76356064440.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 5184 bytes
SHA-256: c5cc8273205aaeac8cc61dea48e20e361d07c32ad8ee9525cdfeb71b5b135b77
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10664 bytes
SHA-256: 74d00875fbeacc2e04097264a0aed53c7c743ae609936048141129a037a8cc6d
font_02_sfnt_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.